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In triangle ACE
CE = 10800 m
AC=BD
In triangle BED
CD+DE=CE
CD+3600=10800
CD=10800-3600=7200 m
Distance travelled = 7200 m
Time taken = 30 seconds
In 1 seconds = 240 m
In 3600 seconds ( 1 hour ) = 240×3600 = 86400 m = 864 km
Speed = 864 km/h
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